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Old 03-07-2005, 02:34 PM
matt_ramsey's Avatar
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valve spring diameters

Does anyone know what would be the stock valve spring diameter for a set of 80's 305 truck heads, and about how large of a diameter spring do you think they could accomodate? I have heard that 1.25" springs are easy to find, but I'm seeing a lot of 1.265" springs out there... How big can I go safely before I have to have the heads modified? Thanks!
-matt ramsey

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Old 03-07-2005, 02:58 PM
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1.265 will fit. About $40 for a Z28 type spring. I would guess 1.55 would be the biggest single spring to fit.
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Old 03-07-2005, 03:01 PM
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Johnson has you on the right direction. 1.5" is about the largest you can go on stock heads without running into problems. OEM springs will be around 1.255 to 1.265.

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